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Now downloading free:PassLabs AlephOno


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File name:PassLabs-AlephOno preamp.pdf
[preview AlephOno]
Size:333 kB
Extension:pdf
MD5:557bdefdc852d3245e98f4c5947ea898
Mfg:PassLabs
Model:AlephOno 🔎
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Descr:preamp
Group:Electronics > Consumer electronics > Audio >
Uploaded:25-01-2010
User:AndyMn
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PassLabs-AlephOno preamp.pdfPASS LABORATORIES ALEPH ONO SERVICE MANUAL REV 0, 1, 2, 3 9/30/1997 Product Description The Aleph Ono starts off with a low noise power supply using a custom designed, shielded, low noise 60 Watt toroid transformer. This gives plus and minus 42-volt DC primary supplies. These are passively filtered with resistors and capacitors. The rails are then actively regulated down to plus and minus 32 volts with zero feedback Mosfets, Q9 for the positive rail and Q23 for the negative. The Mosfets references are filtered zener stacks of four 9.1 volt zeners. These supplies are then passively filtered again for each channel. The moving coil stage has it's own separate capacitance multiplier Q24 that regulates down to 26 Volts for Q14 the MC amp cascode. The moving coil stage uses 4 matched very low noise Jfets (Q 10 - Q13) operated in parallel giving a noise floor of 475 picovolts. These are operated at about 15 volts on the drain. These devices operate feedback free and feed a cascode stage (Q14

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